I've ran a simple test using the data you mentioned and it seems to work fine. Can you post the rest of the lines from your input file, and the code you're using (altered to hide confidential data if necessary)?
My code is:
data test;
format a $10.;
format b $10.;
infile '~/test.csv' dlm=',';
input a $ b $;
run;
Sample input file is attached.
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